docs(entity): add mapOne

projects/ngrx.io/content/guide/entity/adapter.md

@@ -83,18 +83,19 @@ The entity adapter also provides methods for operations against an entity. These
 one to many records at a time. Each method returns the newly modified state if changes were made and the same
 state if no changes were made.
 
-- `addOne`: Add one entity to the collection
-- `addMany`: Add multiple entities to the collection
-- `setAll`: Replace current collection with provided collection
-- `setOne`: Add or Replace one entity in the collection
-- `removeOne`: Remove one entity from the collection
-- `removeMany`: Remove multiple entities from the collection, by id or by predicate
-- `removeAll`: Clear entity collection
+- `addOne`: Add one entity to the collection.
+- `addMany`: Add multiple entities to the collection.
+- `setAll`: Replace current collection with provided collection.
+- `setOne`: Add or Replace one entity in the collection.
+- `removeOne`: Remove one entity from the collection.
+- `removeMany`: Remove multiple entities from the collection, by id or by predicate.
+- `removeAll`: Clear entity collection.
 - `updateOne`: Update one entity in the collection. Supports partial updates.
 - `updateMany`: Update multiple entities in the collection. Supports partial updates.
 - `upsertOne`: Add or Update one entity in the collection. Supports partial updates.
 - `upsertMany`: Add or Update multiple entities in the collection. Supports partial updates.
-- `map`: Update multiple entities in the collection by defining a map function, similar to [Array.map](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map)
+- `mapOne`: Update one entity in the collection by defining a map function.
+- `map`: Update multiple entities in the collection by defining a map function, similar to [Array.map](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map).
 
 Usage:
 
@@ -107,7 +108,7 @@ export interface User {
 
 <code-example header="user.actions.ts">
 import { createAction, props } from '@ngrx/store';
-import { Update, EntityMap, Predicate } from '@ngrx/entity';
+import { Update, EntityMap, EntityMapOne, Predicate } from '@ngrx/entity';
 
 import { User } from '../models/user.model';
 
@@ -119,6 +120,7 @@ export const addUsers = createAction('[User/API] Add Users', props<{ users: User
 export const upsertUsers = createAction('[User/API] Upsert Users', props<{ users: User[] }>());
 export const updateUser = createAction('[User/API] Update User', props<{ update: Update&lt;User&gt; }>());
 export const updateUsers = createAction('[User/API] Update Users', props<{ updates: Update&lt;User&gt;[] }>());
+export const mapUser = createAction('[User/API] Map User', props<{ entityMap: EntityMapOne&lt;User&gt; }>());
 export const mapUsers = createAction('[User/API] Map Users', props<{ entityMap: EntityMap&lt;User&gt; }>());
 export const deleteUser = createAction('[User/API] Delete User', props<{ id: string }>());
 export const deleteUsers = createAction('[User/API] Delete Users', props<{ ids: string[] }>());
@@ -168,6 +170,9 @@ const userReducer = createReducer(
   on(UserActions.updateUsers, (state, { updates }) => {
     return adapter.updateMany(updates, state);
   }),
+  on(UserActions.mapUser, (state, { entityMap }) => {
+    return adapter.map(entityMap, state);
+  }),
   on(UserActions.mapUsers, (state, { entityMap }) => {
     return adapter.map(entityMap, state);
   }),